Arene Complexes with Weak Interactions: A Macrocyclic Tris(arene) Complex of Gallium(I) with η¹⁸ Coordination

Ga⁺ fits exactly into the cavity of [2.2.2]paracyclophane; the cation 1 is the first tris(arene) complex with neutral arene moieties. All 18 ring C atoms are bound nearly identically to Ga⁺, as revealed by the bond lengths (2.911–3.079 Å). In addition, a weak contact exists with a bromine atom of the counterion GaBr 4−. The compound 1·GaBr 4− forms colorless, only slightly air‐sensitive crystals. (Figure Presented.)